Probing beyond the laser coherence time in optical clock comparisons

Abstract

We develop differential measurement protocols that circumvent the laser noise limit in the stability of optical clock comparisons by synchronous probing of two clocks using phase-locked local oscillators. This allows for probe times longer than the laser coherence time, avoids the Dick effect, and supports Heisenberg-limited measurement precision. We present protocols for such frequency comparisons and develop numerical simulations of the protocols with realistic noise sources. These methods provide a route to reduce frequency ratio measurement durations by more than an order of magnitude.

Replaced with published version. 8 pages, 4 figures

References in corpus (10)

• 14-qubit entanglement: creation and coherence
• Systematic evaluation of an atomic clock at 2e-18 total uncertainty
• 8E-17 fractional laser frequency instability with a long room-temperature cavity
• Observation of the 1S0 - 3P0 clock transition in 27Al+
• Coherent optical phase transfer over a 32-km fiber with 1-s instability at $10^{-17}$
• Noise and instability of an optical lattice clock
• Frequency ratios of Sr, Yb and Hg based optical lattice clocks and their applications
• Phase locking a clock oscillator to a coherent atomic ensemble
• Stability enhancement by joint phase measurements in a single cold atomic fountain
• Optimizing Passive Quantum Clocks

Cited by in corpus (25)

• An ${}^{27}$Al${}^{+}$ quantum-logic clock with systematic uncertainty below $10^{-18}$
• Atomic Clocks for Geodesy
• A quantum network of entangled optical atomic clocks
• Sympathetic ground state cooling and time-dilation shifts in an ${}^{27}{\text{Al}}^{+}$ optical clock
• Quantum Variational Optimization of Ramsey Interferometry and Atomic Clocks
• Entanglement-enhanced quantum metrology: from standard quantum limit to Heisenberg limit
• Comparing optical oscillators across the air to milliradians in phase and $10^{-17}$ in frequency
• Improving cold-atom sensors with quantum entanglement: Prospects and challenges
• Heisenberg-limited noisy atomic clock using a hybrid coherent and squeezed states protocol
• Prospects and challenges for squeezing-enhanced optical atomic clocks
• Lifetime-Limited Interrogation of Two Independent ${}^{27}{\text{Al}}^{+}$ Clocks Using Correlation Spectroscopy
• Systematic uncertainty due to background-gas collisions in trapped-ion optical clocks
• Robust optical clock transitions in trapped ions
• A tweezer clock with half-minute atomic coherence at optical frequencies and high relative stability
• Multi-zone trapped-ion qubit control in an integrated photonics QCCD device
• GHZ protocols enhance frequency metrology despite spontaneous decay
• Impacts of random filling on spin squeezing via Rydberg dressing in optical clocks
• Improved absolute clock stability by the joint interrogation of two atomic states
• Phase-stabilized UV light at 267 nm through twofold second harmonic generation
• Vibrational dephasing in matter-wave interferometers
• Toward a quantum-enhanced strontium optical lattice clock at INRIM
• Enhancing Dynamic Range of Sub-Quantum-Limit Measurements via Quantum Deamplification
• Nuclear spin quenching of the ${}^2{S}_{1/2}\to {}^2{F}_{7/2}$ electric octupole transition in ${}^{173}$Yb${}^{+}$
• Bayesian Frequency Metrology with Optimal Ramsey Interferometry in Optical Atomic Clocks
• Dynamic decoupling of laser phase noise in compound atomic clocks